In Science and Technology
- mya (unit), sometimes written as Ma, means "millions of years ago" or megaannum.
- .ma, the Internet country code top-level domain (ccTLD) for Morocco
- Mach number (Ma), a measure of speed compared to the speed of sound
- Megaannum (Ma), one million (1,000,000) years
- Mechanical advantage (MA), mechanical multiplier of input force
- Mechanical alloying (MA), a technique to produce alloys.
- Medical assistant (MA), a type of health care worker
- Methyl anthranilate (MA), a bird repellent
- Milliampere (mA) and Mega-ampere or Megampere (MA), multiples of Ampere, a unit of electrical current
- Moving average model (MA(q)), statistics
- MA (complexity), a set of decision problems that can be decided by an Arthur–Merlin protocol
- Martin's axiom, an axiom in mathematical logic
- a type of interface (Ma) in an IP Multimedia Subsystem
- Minor actinides (MA), the actinide elements in used nuclear fuel other than uranium and plutonium
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